Yantras are great cosmic conductors of energy, an antenna of Nature, a powerful tool for harmony, prosperity, success, good health, yoga and meditation. Yantras are usually made out of copper and consist of a series of geometric patterns. The eyes and mind concentrate at the center of the yantra to achieve higher levels of consciousness. If one doesn't have an idol which one wishes to worship then one can worship the Yantra of that particular God eg: Ganesha Yantra. The Ganesha Yantra is a sacred energy device that infuses within you the power to focus and accomplish your goals. The radiations from the Yantra will enhance your positive spirits and stimulate your confidence level to succeed in all your efforts. Ganesha is the fundamental God of wisdom who removes all the obstacles that stand in your way of success. Obstacles are things we do not foresee and thus cannot plan for. Offering prayers to Lord Ganesha to remove obstacles before undertaking any task is a customary practice that helps to ensure a project moves forward successfully. To remove obstacles and negative forces that prevent your spiritual and material progress, this Yantra can come in handy. Detail scientific information and procedures about Ganesh Yantra is given in Meru Tantra, Sharadatilak, Shakta Pramod, Mantramaharnav, Mantra Mahodadhi. Some of the information available in Ganesh Purva -Tapiny Upanishad and Ganesh Purana. There are four types of Yantras, namely Bhu-prushtha, Kurma-prushtha, Padma-prushtha and Meru-prushtha. The lines on Bhu-prushtha are deeply engraved on the Yantra, where as lines on Kurma-prushtha and Padma-prushtha are on the Yantra, but not deep. Three different types of Aavahan(invocation)and Prana Pratishtha(consecration of an idol) of Yantra can be Achala(non-movable/stable), Chala(can be moved) and Dharana(can wear). In Achala Pran Pratishtha one can not move the Yantra from the fixed place. In Chala Pran Pratishtha, one can move the Yantra from one place to another along with the respective God. In Dharana Pran Pratishtha, the Yantra should always be on the body and one can take away the Yantra from the body only for worshipping of the Yantra. According to the experts, the weight of the metalic Yantra is very specific. If the weight is not proper then it affects the worshipping. The Yantras are more effective and powerful when engraved on the Praval(coral), Padmarag(ruby), Neelmani(sapphire), Vaidurya(cat-eye) than the Yantra carved on Copper or drawn on silk cloth/paper and very much benificial to the worshipper. If Yantra is engraved on Copper it acts 100 times faster, on Silver it acts 10,000 times faster, on Gold or Crystal it acts million times faster compared with the silk cloth/paper. It is advisable to worship any kind of Yantra under the supervision of an expert.